android清理app缓存，计算缓存大小 工具类

public class DataCleanManager {
	/**
	 * @param context
	 * @return
	 * @throws Exception
	 *             获取当前缓存
	 */
	public static String getTotalCacheSize(Context context) throws Exception {
		long cacheSize = getFolderSize(context.getCacheDir());
		if (Environment.getExternalStorageState().equals(
				Environment.MEDIA_MOUNTED)) {
			cacheSize += getFolderSize(context.getExternalCacheDir());
		}
		return getFormatSize(cacheSize);
	}

	/**
	 * @param context
	 *            删除缓存
	 */
	public static void clearAllCache(Context context) {
		deleteDir(context.getCacheDir());
		if (Environment.getExternalStorageState().equals(
				Environment.MEDIA_MOUNTED)) {
			deleteDir(context.getExternalCacheDir());
		}
	}

	private static boolean deleteDir(File dir) {
		if (dir != null && dir.isDirectory()) {
			String[] children = dir.list();
			int size = 0;
			if (children != null) {
				size = children.length;
				for (int i = 0; i < size; i++) {
					boolean success = deleteDir(new File(dir, children[i]));
					if (!success) {
						return false;
					}
				}
			}

		}
		if (dir == null) {
			return true;
		} else {

			return dir.delete();
		}
	}

	// 获取文件
	// Context.getExternalFilesDir() --> SDCard/Android/data/你的应用的包名/files/
	// 目录，一般放一些长时间保存的数据
	// Context.getExternalCacheDir() -->
	// SDCard/Android/data/你的应用包名/cache/目录，一般存放临时缓存数据
	public static long getFolderSize(File file) throws Exception {
		long size = 0;
		try {
			File[] fileList = file.listFiles();
			int size2 = 0;
			if (fileList != null) {
				size2 = fileList.length;
				for (int i = 0; i < size2; i++) {
					// 如果下面还有文件
					if (fileList[i].isDirectory()) {
						size = size + getFolderSize(fileList[i]);
					} else {
						size = size + fileList[i].length();
					}
				}
			}

		} catch (Exception e) {
			e.printStackTrace();
		}
		return size;
	}

	/**
	 * 格式化单位
	 * 计算缓存的大小
	 * @param size
	 * @return
	 */
	public static String getFormatSize(double size) {
		double kiloByte = size / 1024;
		if (kiloByte < 1) {
			// return size + "Byte";
			return "0K";
		}

		double megaByte = kiloByte / 1024;
		if (megaByte < 1) {
			BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));
			return result1.setScale(2, BigDecimal.ROUND_HALF_UP)
					.toPlainString() + "KB";
		}

		double gigaByte = megaByte / 1024;
		if (gigaByte < 1) {
			BigDecimal result2 = new BigDecimal(Double.toString(megaByte));
			return result2.setScale(2, BigDecimal.ROUND_HALF_UP)
					.toPlainString() + "MB";
		}

		double teraBytes = gigaByte / 1024;
		if (teraBytes < 1) {
			BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));
			return result3.setScale(2, BigDecimal.ROUND_HALF_UP)
					.toPlainString() + "GB";
		}
		BigDecimal result4 = new BigDecimal(teraBytes);
		return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString()
				+ "TB";
	}
	
}